Puree the tomatoes: Blend the content of the can with an immersion blender or a normal blender or a food processor.
Cook: Transfer the onion, the garlic and the olive oil to a deep saucepan and cook over medium/high heat until the onion is translucent (3-4 minutes). Add the pureed tomatoes, the oregano, a pinch of salt and freshly grated black pepper according to your taste.
Reduce the heat to a gentle simmer and cook until the sauce thickens, about 20-30 minutes (time will vary depending on the heat and the size of the pan).
Taste and adjust: Once the sauce has thickened, taste and add the sugar and more salt if needed. Take off the heat, add the basil and stir.
Use immediately or store: Let it cool for a few minutes, discard the garlic, spoon the sauce over your pizza dough and top with your favorite ingredients.
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